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1
16 package com.blandware.atleap.webapp.servlet;
17
18 import com.blandware.atleap.common.Constants;
19 import com.blandware.atleap.model.core.ContentImage;
20 import com.blandware.atleap.model.core.Role;
21 import com.blandware.atleap.service.core.ContentResourceManager;
22 import com.blandware.atleap.webapp.form.core.UploadContentResourceForm;
23 import com.blandware.atleap.webapp.util.core.GlobalProperties;
24 import com.blandware.atleap.webapp.util.core.ImageUtil;
25 import com.blandware.atleap.webapp.util.core.ResourceTypesManager;
26 import com.blandware.atleap.webapp.util.core.WebappConstants;
27 import org.apache.commons.logging.Log;
28 import org.apache.commons.logging.LogFactory;
29 import org.apache.struts.upload.FormFile;
30 import org.springframework.context.ApplicationContext;
31 import org.springframework.web.context.support.WebApplicationContextUtils;
32
33 import javax.imageio.IIOImage  ;
34 import javax.servlet.ServletConfig ;
35 import javax.servlet.ServletContext ;
36 import javax.servlet.ServletException ;
37 import javax.servlet.http.HttpServlet ;
38 import javax.servlet.http.HttpServletRequest ;
39 import javax.servlet.http.HttpServletResponse ;
40 import java.io.ByteArrayOutputStream ;
41 import java.io.IOException ;
42 import java.io.OutputStream ;
43 import java.util.List ;
44
45
57 public class ThumbnailServlet extends HttpServlet {
58
59
62 protected transient final Log log = LogFactory.getLog(ThumbnailServlet.class);
63
64 public static final String THUMBNAIL_DEFAULT_WIDTH_KEY = "thumbnail.default.width";
65 public static final String THUMBNAIL_DEFAULT_HEIGHT_KEY = "thumbnail.default.height";
66
67 private ResourceTypesManager resourceTypesManager = null;
68 private ApplicationContext ctx = null;
69
70
73 public void init(ServletConfig config) throws ServletException {
74 super.init(config);
75 resourceTypesManager = ResourceTypesManager.getInstance(getServletContext());
76 ctx = WebApplicationContextUtils.getRequiredWebApplicationContext(getServletContext());
77 }
78
79
82 public void destroy() {
83
84 }
85
86
92 protected void processRequest(HttpServletRequest request, HttpServletResponse response)
93 throws ServletException , IOException {
94
95 Long contentResourceId = null;
96 if ( request.getParameter("contentResourceId") != null ) {
97 contentResourceId = Long.valueOf(request.getParameter("contentResourceId"));
98 } else if ( request.getAttribute("contentResourceId") != null ) {
99 contentResourceId = (Long ) request.getAttribute("contentResourceId");
100 }
101
102 ServletContext servletContext = request.getSession().getServletContext();
103
104 int maxWidth = GlobalProperties.getInstance(servletContext).getInteger(THUMBNAIL_DEFAULT_WIDTH_KEY).intValue();
105 int maxHeight = GlobalProperties.getInstance(servletContext).getInteger(THUMBNAIL_DEFAULT_HEIGHT_KEY).intValue();
106 try {
107 if ( request.getParameter("width") != null ) {
108 maxWidth = Integer.valueOf(request.getParameter("width")).intValue();
109 }
110 if ( request.getParameter("height") != null ) {
111 maxHeight = Integer.valueOf(request.getParameter("height")).intValue();
112 }
113 } catch ( Exception ex ) {
114 }
116
117 UploadContentResourceForm uploadContentResourceForm = (UploadContentResourceForm) request.getSession().getAttribute(WebappConstants.UPLOAD_CONTENT_RESOURCE_FORM_KEY);
118 FormFile file = null;
119 if ( uploadContentResourceForm != null ) {
120 file = uploadContentResourceForm.getFile();
121 }
122
123 String mimeType = null;
124 String resourceType = null;
125 byte[] imageData;
126
127 if ( contentResourceId != null ) {
128 ContentResourceManager contentResourceManager = (ContentResourceManager) ctx.getBean(Constants.CONTENT_RESOURCE_MANAGER_BEAN);
129 ContentImage contentImage = contentResourceManager.retrieveContentImage(contentResourceId);
130
131 if ( contentImage == null ) {
132 String message = "No content resource with ID=" + contentResourceId + " could be found";
133 if ( log.isErrorEnabled() ) {
134 log.error(message);
135 }
136 throw new ServletException (message);
137 }
138
139 List roles = contentImage.getRoles();
141 boolean granted = false;
142 if ( roles != null && roles.size() > 0 ) {
143 for ( int i = 0; i < roles.size(); i++ ) {
144 Role role = (Role) roles.get(i);
145 if ( request.isUserInRole(role.getName()) ) {
146 if ( log.isDebugEnabled() ) {
147 log.debug(" User '" + request.getRemoteUser() +
148 "' has role '" + role.getName() + "', granting access");
149 }
150 granted = true;
151 break;
152 }
153 }
154 } else {
155 granted = true;
156 if ( log.isDebugEnabled() ) {
157 log.debug("Anonymous user granting access");
158 }
159 }
160
161 if ( !granted ) {
162 if ( log.isDebugEnabled() ) {
164 log.debug(" User '" + request.getRemoteUser() +
165 "' does not have any required role, denying access");
166 }
167 response.sendError(HttpServletResponse.SC_FORBIDDEN);
168 return;
169 }
170
171 imageData = contentImage.getResourceData().getData();
172 mimeType = contentImage.getMimeType();
173 resourceType = contentImage.getType();
174
175 if ( log.isDebugEnabled() ) {
176 log.debug("Showing thumbnail from DB with mimeType=" + mimeType);
177 }
178
179 } else if ( file != null && file.getFileName() != null && file.getFileName().trim().length() != 0 ) {
180
181 mimeType = resourceTypesManager.getMimeTypeByFileName(file.getFileName());
182 resourceType = resourceTypesManager.getResourceTypeByFileName(file.getFileName());
183 imageData = file.getFileData();
184
185 if ( log.isDebugEnabled() ) {
186 log.debug("Showing thumbnail from session with mimeType=" + mimeType);
187 }
188
189 } else {
190 String message = "There are neither contentResourceId parameter in request nor " + WebappConstants.UPLOAD_CONTENT_RESOURCE_FORM_KEY + " attribute in session";
191 if ( log.isWarnEnabled() ) {
192 log.warn(message);
193 }
194 response.sendError(HttpServletResponse.SC_NOT_FOUND);
195 return;
196 }
197
198 if ( !resourceType.equalsIgnoreCase(Constants.RESOURCE_TYPE_IMAGE) ) {
199 String message = "Resource type must be image";
200 if ( log.isErrorEnabled() ) {
201 log.error(message);
202 }
203 throw new ServletException (message);
204 }
205
206 OutputStream out = response.getOutputStream();
207
208 try {
209 IIOImage source = ImageUtil.decodeImage(imageData, mimeType);
210 IIOImage scaled = ImageUtil.scaleToRectangle(source, maxWidth, maxHeight);
211 if ( source != scaled ) {
212 ByteArrayOutputStream scaledStream = new ByteArrayOutputStream ();
213 try {
214 ImageUtil.encodeImage(scaled, scaledStream, mimeType);
215 } catch ( IllegalArgumentException ex ) {
216 mimeType = resourceTypesManager.getDefaultMimeType(resourceType);
218 response.setContentType(mimeType);
219 ImageUtil.encodeImage(scaled, scaledStream, mimeType);
220 }
221 imageData = scaledStream.toByteArray();
222 scaledStream.close();
223 }
224 } catch ( IOException ex ) {
225 if ( log.isErrorEnabled() ) {
226 log.error("Cannot read image, maybe data corrupted", ex);
227 }
228 }
229
230 response.addHeader("Cache-Control", "no-cache,no-store,max-age=0");
231 response.addHeader("Pragma", "No-cache");
232 response.setDateHeader("Expires", 1);
233 response.setContentType(mimeType);
234 response.setContentLength(imageData.length);
235 out.write(imageData);
236
237 out.close();
238 }
239
240
246 protected void doGet(HttpServletRequest request, HttpServletResponse response)
247 throws ServletException , IOException {
248 processRequest(request, response);
249 }
250
251
257 protected void doPost(HttpServletRequest request, HttpServletResponse response)
258 throws ServletException , IOException {
259 processRequest(request, response);
260 }
261
262
265 public String getServletInfo() {
266 return "Servlet to view thumbnail of image content resource";
267 }
268
269 } |
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